Mr Besley will be based in Melbourne, working alongside Sydney-based sales manager Matthew Young to support the firm in growing its retail business.
Robeco's head of Australia, Stephen Dennis, said the additional appointment has been “long anticipated” following the growth the business has seen since it established an Australian office in 2012.
“We are delighted to welcome Sam to the team as he brings a wealth of local industry knowledge and experience," Mr Dennis said.
“Sam will serve clients across Victoria, South Australia and Tasmania, allowing us to extend our footprint and bring our investment offerings, service and insights to more advisers."